<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!--内部样式-->
    <style>
        h1{
            color: blue!important;
            font-size: 30px;
        }
    </style>
</head>
<body>
<!--内敛样式-->
<h1 style="color: red;font-size: 20px">hello</h1>

</body>
</html>